Activity of TRAPPIST-1 analogue stars observed with TESS
B\'alint Seli, Kriszti\'an Vida, Attila Mo\'or, Andr\'as P\'al,, Katalin Ol\'ah

TL;DR
This study analyzes the magnetic activity of TRAPPIST-1-like ultracool dwarfs using TESS data, revealing flare behaviors, rotation periods, and age correlations to understand their habitability implications.
Contribution
It provides the first comprehensive analysis of flare activity and rotation in a volume-limited sample of ultracool dwarfs similar to TRAPPIST-1 using TESS data.
Findings
Flare frequency distribution follows a power law similar to TRAPPIST-1.
Detected flares up to 3 x 10^{33} erg.
Identified rotational periods shorter than 5 days for 42 stars.
Abstract
As more exoplanets are being discovered around ultracool dwarfs, understanding their magnetic activity -- and the implications for habitability -- is of prime importance. To find stellar flares and photometric signatures related to starspots, continuous monitoring is necessary, which can be achieved with spaceborn observatories like the Transiting Exoplanet Survey Satellite (TESS). We present an analysis of TRAPPIST-1 like ultracool dwarfs with TESS full-frame image photometry from the first two years of the primary mission. A volume-limited sample up to 50 pc is constructed consisting of 339 stars closer than 0.5 mag to TRAPPIST-1 on the Gaia colour-magnitude diagram. The 30-min cadence TESS light curves of 248 stars were analysed, searching for flares and rotational modulation caused by starspots. The composite flare frequency distribution of the 94 identified flares shows a power law…
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